package org.glvnsjc.util;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.ResourceBundle;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.glvnsjc.model.LabelValue;

/**
 * Utility class to convert one object to another.
 * 
 * @author <a href="mailto:matt@raibledesigns.com">Matt Raible</a>
 */
public final class ConvertUtil
{
    private static final Log log = LogFactory.getLog( ConvertUtil.class );

    /**
     * Checkstyle rule: utility classes should not have public constructor
     */
    private ConvertUtil()
    {
    }

    /**
     * Method to convert a ResourceBundle to a Map object.
     * @param rb a given resource bundle
     * @return Map a populated map
     */
    public static Map<String, String> convertBundleToMap( ResourceBundle rb )
    {
        Map<String, String> map = new HashMap<String, String>();

        Enumeration<String> keys = rb.getKeys();
        while ( keys.hasMoreElements() )
        {
            String key = keys.nextElement();
            map.put( key, rb.getString( key ) );
        }

        return map;
    }

    /**
     * Convert a java.util.List of LabelValue objects to a LinkedHashMap.
     * @param list the list to convert
     * @return the populated map with the label as the key
     */
    public static Map<String, String> convertListToMap( List<LabelValue> list )
    {
        Map<String, String> map = new LinkedHashMap<String, String>();

        for ( LabelValue option : list )
        {
            map.put( option.getLabel(), option.getValue() );
        }

        return map;
    }

    /**
     * Method to convert a ResourceBundle to a Properties object.
     * @param rb a given resource bundle
     * @return Properties a populated properties object
     */
    public static Properties convertBundleToProperties( ResourceBundle rb )
    {
        Properties props = new Properties();

        for ( Enumeration<String> keys = rb.getKeys(); keys.hasMoreElements(); )
        {
            String key = keys.nextElement();
            props.put( key, rb.getString( key ) );
        }

        return props;
    }

    /**
     * Convenience method used by tests to populate an object from a
     * ResourceBundle
     * @param obj an initialized object
     * @param rb a resource bundle
     * @return a populated object
     */
    public static Object populateObject( Object obj, ResourceBundle rb )
    {
        try
        {
            Map<String, String> map = convertBundleToMap( rb );
            BeanUtils.copyProperties( obj, map );
        }
        catch ( Exception e )
        {
            e.printStackTrace();
            log.error( "Exception occurred populating object: " + e.getMessage() );
        }

        return obj;
    }
}
